The girls already had their comeback on ‘K-Pop Star 2‘ and scored an all-kill on the charts. “Somebody” is written by Shim Eun Ji, who also wrote 15&’s debut single “I Dream“, as well as Jo Kwon‘s “The Day I Confessed“ and IU‘s “I Really Hate Him“. It’s composed by Ryan S. Jhun and Antwann Frost.